准噶尔盆地西北缘车—拐地区三叠系沉积相特征

The characteristic of triassic sedimentary facies in Che-Guai area of Northwest Margin,Junggar Basin

通过岩心观察、薄片鉴定、测井和录井资料分析,以及单井沉积相、剖面沉积相研究,结合研究区的构造背景和沉积环境,分析沉积相特征.结果表明:准噶尔盆地西北缘车—拐地区三叠系主要发育砾岩和砂岩;三叠系的主要物源来自研究区西北角,次要物源来自研究区西部C45井以西.该区百口泉组主要发育冲积扇、扇三角洲沉积,冲积扇由研究区西北部向东南部延伸,克拉玛依组在继承百口泉组沉积特征的基础上,主要发育由西北向东南方向的扇三角洲前缘亚相沉积;白碱滩组在继承克拉玛依组沉积特征的基础上,主要发育扇三角洲前缘亚相及浅湖亚相沉积.三叠系由早期到晚期的水进沉积特征控制了研究区优质储层的分布.

According to the observation of rock cores,the identification of slices and the analysis of logging,the sedimentary facies of single-well,section and plain,combining the tectonic background and sedimentary environment of this area,we studied the sedimentary characteristics of Triassic in Che-Guai area,northwest margin of Junggar Basin.We found that conglomerate and sandstone mainly develops;the primary provenance is Northwest margin,and the secondary source area is the west area of Well C45.Baikouquan Formation mainly develops alluvial fan and fan-delta deposit,the alluvial fan extends from northwest to southeast.Karamay Formation inherits the sedimentary features of Baikouquan Formation,and mainly develops fan-delta front subfacies extends from northwest to southeast,Baijiantan Formation inherits the sedimentary features of Karamay Formation,and fan-delta front subfacies and shallow lake deposits in chief.From early to late stage,the transgressive sedimentary characteristic of Triassic dominantly controls the distribution of high quality reservoir.